Thermodynamic properties, defect analysis, and electrical conductivity of the La0.8Sr0.2ScxMn1-xO3- infiltrated into YSZ scaffolds

Sivaprakash Sengodan, Jihoon Kim, Jeeyoung Shin, Guntae Kim

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

La0.8Sr0.2ScxMn1-xO 3--yttria stabilized zirconia composite anodes were synthesized by infiltration and investigated as alternative anodes for intermediate solid oxide fuel cells. Non-stoichiometric variation of oxygen content and electrical conductivity in La0.8Sr0.2ScxMn 1-xO3--yttria stabilized zirconia composite was studied by high temperature coulometric titration at 923-1023 K. La0.8Sr 0.2ScxMn1-xO3- shows an oxygen deficient composition depending on the oxygen partial pressure, temperature, and Sc content. A defect chemistry model is presented by taking into consideration the interaction of randomly distributed defects, SrLa′, VO, OOX, MnMnX, MnMn and ScMnX. The proposed defect model fits well with experimental non-stoichiometric data. The interaction among the defects for vacancy formation is strongly influenced by the amount of dopant, Sc content, and temperature. The thermodynamic properties, oxidation enthalpy ΔH and entropy ΔS, were obtained from the oxygen isotherms. The electrical conductivities measured by the 4-probe method as a function of oxygen partial pressure and temperature were high enough for composite anode application.

Original languageBritish English
Pages (from-to)B1373-B1379
JournalJournal of the Electrochemical Society
Volume158
Issue number11
DOIs
StatePublished - 2011

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